overgrowth

noun
over·growth | \ˈō-vər-ˌgrōth \

Medical Definition of overgrowth 

1a : excessive growth or increase in numbers an overgrowth of bacteria…may achieve pathogenic proportionsJournal of the American Medical Association an overgrowth of yeast in the mouth

b : hypertrophy, hyperplasia

2 : something (as cells or tissue) grown over something else

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